Monitoring device of a spun yarn, a yarn winding machine and method of monitoring a yarn.

专利摘要:
A yarn monitoring device includes a sensor unit, an acquisition section, a setting section and an evaluation section. The sensor unit emits a detection value corresponding to a presence / absence of the yarn in the detection region and / or to a state of the yarn. The acquisition section acquires the detection value in a state in which the yarn is not present in the detection region. The setting section sets an evaluation reference value based on at least one of a plurality of detection values obtained by repeating the acquisition of the detection value by means of the acquisition section until the yarn is introduced into the detection region. The evaluation section evaluates the yarn status based on the evaluation reference value set by the setting section.
公开号:CH710191A2
申请号:CH01387/15
申请日:2015-09-24
公开日:2016-03-31
发明作者:Satoshi Kawabata
申请人:Murata Machinery Ltd；
IPC主号:

专利说明:

[0001] INTRODUCTION TO THE INVENTION
1. Field of invention
[0001] The present invention mainly concerns a monitoring device for a yarn suitable for monitoring a moving yarn.
2. Description of the known art
[0002] Conventionally, a yarn winding machine configured to wind a yarn around a bobbin, such as a spinning machine and an automatic winder, is known. This type of yarn winding machine comprises a yarn monitoring device. An optical monitoring device of a yarn irradiates the moving yarn with light and measures the light transmitted through the yarn or light reflected from the yarn in order to monitor the state of the yarn in real time and detect a yarn defect (portion with a anomaly in yarn quality).
[0003] Unexamined Japanese patent publications nos. 2013-204 190 and 2013-203 527 and the Japanese patent n. 3 707 413 disclose an optical monitoring device for a yarn.
[0004] The amount of light (light projection quantity) radiated by a light projection section of the yarn monitoring device may vary due to a thermal drift. In particular, during a constant period immediately following the switching on of the yarn monitoring device, the temperature of the light projection section can increase considerably and the amount of light projection can be reduced in a few seconds before the introduction of the yarn . Consequently, when the yarn is introduced into the yarn monitoring device after a few seconds have elapsed from the setting of an evaluation reference value (zero point) of the yarn monitoring device, the yarn monitoring device cannot accurately detect the state of the yarn. Furthermore, the properties of a yarn monitoring device can vary not only due to the heat of the light projection section but, for example, also due to humidity and the like. In the case of a capacitive monitoring device for a yarn, humidity influences the properties of a yarn monitoring device.
[0005] Unexamined Japanese patent publications nos. 2013-204 190 and 2013-203 527 and the Japanese patent n. 3707413 describe the adjustment of an evaluation reference value of the yarn monitoring device but do not describe a technique for adjusting the evaluation reference value taking into account the thermal drift.
BRIEF SUMMARY OF THE INVENTION
[0006] The present invention has been realized in the light of the above circumstances and one of its main object is to provide a monitoring device for a yarn capable of reducing the influence of an environmental change and of accurately detecting a state of a yarn.
[0007] The problems which the present invention intends to solve are described above; the means and effects to solve these problems will be described below.
[0008] According to a first aspect of the present invention, a monitoring device is provided for a yarn having the following configuration. Specifically, the yarn monitoring device comprises a sensing section, an acquisition section, a setting section and an evaluation section. The detection section is adapted to emit a detection value corresponding to a presence / absence of a yarn in a detection region and corresponding to a state of a yarn when the yarn is present in the detection region. The acquisition section is adapted to acquire the detection value in a state in which the yarn is not present in the detection region. The setting section is designed to set an evaluation reference value that can be used in assessing the state of the yarn. The evaluation section is designed to evaluate the state of the yarn based on the evaluation reference value set by the setting section and the detection value emitted by the detection section. The setting section sets the evaluation reference value on the basis of at least one of a plurality of detection values acquired by repeating the acquisition of the detection value by means of the acquisition section until the yarn is introduced into the detection region. Alternatively, the setting section sets the evaluation reference value based on one or the plurality of detection values acquired by the acquisition section with a predetermined timing. The predetermined timing is determined on the basis of a time acquired by the acquisition section from the outside, ie the time in which the yarn is introduced into the detection region.
[0009] Therefore, for example, the detection value emitted by the detection section immediately before the yarn is introduced into the detection region can be obtained by continuously and iteratively acquiring the detection value emitted by the detection section. Moreover, the time in which the yarn is introduced into the detection region can be acquired from the outside and the detection value can be acquired with an appropriate timing based on the acquired time, so that the detection value emitted by the section of detection immediately before the yarn is introduced into the detection region is obtained in a similar manner. Therefore, the influence of environmental change (thermal drift, humidity variation, contaminant attack and similarity) is reduced by defining the evaluation reference value by using the sensing value acquired with the relevant timing. Therefore, it is possible to accurately detect the state of the yarn.
[0010] Preferably, the yarn monitoring device described above has the following configuration. Specifically, the yarn monitoring device comprises a section for determining the presence / absence of a yarn. The determination section of the presence / absence of a yarn is adapted to determine whether the yarn is present in a predetermined position of the sensing region and whether the yarn is introduced into the predetermined position of the sensing region. The setting section sets the evaluation reference value based on the detection value acquired by the acquisition section before the determination of the presence / absence of a yarn determines that the yarn is introduced into the detection region.
[0011] This means that, even if the detection value is acquired after the yarn has been introduced into the detection region, this detection value cannot be used as a candidate for the reference value, and therefore it is possible to set a value appropriate valuation reference not using this tracking value.
[0012] Preferably, the yarn monitoring device described above has the following configuration. Specifically, the detection section comprises a projection section of the light designed to project the light onto the sensing region, and a light receiving section adapted to receive the light projected by the light projection section and to emit an electrical signal corresponding to a quantity of light reception. The yarn monitoring device further comprises an adjustment section adapted to carry out an adjustment process for adjusting a light projection amount of the light projection section such that the detection value when the yarn is not present in the region detection coincides with a default value.
[0013] This means that the light projection amount of the light projection section and the light receiving amount of the light receiving section may possibly vary due to environmental change. Therefore, it is possible to actively adjust the amount of light projection based on the environmental change by performing the adjustment process, and it is possible to stabilize the accuracy of evaluation of the state of the yarn.
[0014] Preferably, the yarn monitoring device described above has the following configuration. Specifically, the yarn monitoring device comprises a storage section for storing a first threshold value and a second threshold value. The first threshold value is a value able to define one of the boundaries of a predetermined range with respect to the detection value in a state in which the yarn is not present in the detection region. The second threshold value is a threshold value able to determine whether the yarn is present in the predetermined position of the detection region, the second threshold value being a value outside the predetermined range and a value higher than the first threshold value. . When the acquisition section acquires the detection value between the first threshold value and the second threshold value for a predetermined number of times, one or more times, immediately after the acquisition of the detection value higher than the first threshold value, the adjustment section performs the adjustment process.
[0015] This means that, when the yarn is introduced into the detection region, generally the detection value emitted by the detection unit varies considerably and the acquisition section can acquire the beginning of this variation as a detection value. If the influence of thermal drift is too high to be tolerated, the adjustment process is preferably performed to adapt to environmental change. In this regard, according to the configuration described above, during the period in which the acquisition section acquires the detection value a plurality of times, if the detection value higher than the first threshold value is obtained, and subsequently the value of detection between the first threshold value and the second threshold value, it is assumed that the detection value is increased due to the influence of the thermal drift and, therefore, the adjustment process is performed. Therefore, the adjustment process is performed only when necessary, so that the influence of thermal drift can be accurately eliminated without lowering efficiency, and the assessment of the state of the yarn by the evaluation section can be brought back to a state where the evaluation can be performed accurately.
[0016] In the yarn monitoring device described above, when the acquisition section acquires the detection value higher than the second threshold value immediately after the acquisition of the detection value higher than the first threshold value, preferably the determination section of the presence / absence of the yarn determines that the yarn is introduced into the detection region.
[0017] Therefore, it is possible to determine with a simple process whether the yarn is introduced into the detection region, with a clear distinction from the case in which the detection value exceeds the first threshold value due to the influence of the thermal drift and the like .
[0018] Preferably, the yarn monitoring device described above has the following configuration. Specifically, the detection value acquired by the acquisition section is stored in the storage section. The setting section sets the evaluation reference value based on the detection value stored in the storage section when the yarn is not present in the detection region. When the detection value is a value outside the predetermined range when the yarn is not present in the detection region, the detection value is not stored in the storage section.
[0019] This means that, if the value outside the normal range generally assumed by the value is acquired as a detection value, it is not appropriate to use this detection value for the calculation of the valuation reference value. In this regard, according to the configuration described above, it is prevented that the detection value outside the predetermined range is stored in the storage section, so that it is possible to reliably prevent the detection value outside the the normal range is used to calculate the valuation reference value.
[0020] In the yarn monitoring device described above, preferably the setting section sets the evaluation reference value on the basis of the detection value obtained before a detection value acquisition timing, which corresponds to a predetermined number of times preceding a time point in which the determination of the presence / absence of the yarn determines that the yarn is introduced into the predetermined position of the sensing region.
[0021] This means that, during the introduction of the yarn into the detection region, the detection value emitted by the detection section may show an unstable behavior. In this regard, in the configuration described above, by adopting the detection value preceding a time instant which corresponds to a predetermined number of times preceding a time point in which it is determined that the yarn is introduced into the detection region, the reference value Evaluation can be set using an appropriate detection value from which the influence described above is eliminated.
[0022] In the yarn monitoring device described above, preferably the setting section sets, as an evaluation reference value, an average value of the plurality of detection values acquired by the acquisition section.
[0023] Therefore, it is prevented that the variation of a single detection value due to various types of disturbance is excessively reflected on the evaluation reference value, and it is possible to define the evaluation reference value in an appropriate manner.
[0024] Preferably the yarn monitoring device described above has the following configuration. Specifically, the yarn monitoring device comprises a counting section adapted to count a time elapsed in a state in which the yarn is stationary in the sensing region. When the counting of the counting section exceeds a predetermined time, the monitoring device of a yarn cuts the yarn by means of a cutting device arranged in the monitoring device of a yarn or an external cutting device.
[0025] This means that, for example, when the doffing operation is performed manually, a long period of time can pass with the yarn present in the detection region and without the yarn in motion. In this case, the influence of thermal drift and the like can be a problem. At the same time, even if the set value of the old evaluation reference value is discarded to zero the evaluation reference value, the detection value in a state in which the yarn is not present cannot be acquired by the acquisition section in how much the yarn is already present in the detection region. In this regard, the detection value in a state in which the yarn is not present in the detection region is reacquired by forcibly cutting the yarn as described above, and the evaluation reference value can be reset.
[0026] In a second aspect of the present invention, a yarn winding machine having the following configuration is provided. Specifically, the yarn winding machine comprises a yarn monitoring device, a winding section, a yarn splicing device and a yarn capturing and guiding device. The winding section is adapted to wind the yarn to form a cone. The yarn splicing device is adapted to perform a yarn splicing operation. The yarn capture and guide device is adapted to guide the yarn in the yarn joining device. The acquisition section acquires one or a plurality of detection values with a timing determined on the basis of a timing in which the yarn capture and guide device guides the yarn in the yarn joining device. The setting section sets, as an evaluation reference value, the detection value or an average value of the plurality of detection values acquired by the acquisition section with a determined timing.
[0027] This means that the yarn is not present in the detection region of the yarn monitoring device in a state in which the yarn is interrupted, but the yarn is introduced into the detection region when the yarn splicing device executes the yarn. yarn splicing operation. Therefore, the detection value is acquired with the timing determined on the basis of the timing with which the yarn capture and guide device guides the yarn in the yarn joining device, so that the detection value immediately preceding the introduction of the yarn. yarn in the detection region can be obtained rationally. Furthermore, it is possible to reduce the number of acquisitions of the detection value.
[0028] According to a third aspect of the present invention, a method is provided for monitoring a yarn having the following configuration. Specifically, the method for monitoring a yarn comprises the following steps: detecting a value corresponding to a presence / absence of a yarn in a detection region and corresponding to a state of the yarn in which the yarn is present in the detection region , acquire the detection value when the yarn is not present in the detection region, set an evaluation reference value that can be used in assessing the state of the yarn, and evaluate the state of the yarn based on the evaluation reference value set by the section of setting and the detection value emitted by the detection section, and is characterized by setting the evaluation reference value on the basis of at least one of a plurality of detection values acquired by repeating the acquisition of the detection value until the yarn is introduced in the detection region.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029]<tb> Fig. 1 <SEP> is a side view schematically illustrating a unit for winding a yarn according to an embodiment of the present invention;fig. 2 <SEP> is a side view of a yarn winding unit illustrating a state in which the ends of the yarn are captured by a first yarn capture device and a second yarn capture device;fig. 3 <SEP> is a side view of the winding unit of a yarn illustrating a state in which the ends of the yarn are guided towards a yarn joining device by means of the first yarn capture device and the second yarn capture device ;fig. 4 <SEP> is a block diagram illustrating an electrical configuration of a yarn monitoring device;fig. 5 <SEP> is a graph describing the influence of a thermal drift with respect to the detection value;fig. 6 <SEP> is a graph illustrating a process of a case in which the detection value is significantly increased due to the influence of the thermal drift;fig. 7 <SEP> is a graph illustrating an example of a transition of the detection value when the yarn is introduced into the sensing region;fig. 8 <SEP> is a graph illustrating another example of a transition of the detection value when the yarn is introduced into the sensing region;fig. 9 <SEP> is a flow chart illustrating a process performed by a monitoring section for monitoring a yarn; isfig. 10 <SEP> is a graph describing a process of a case in which the yarn is left on hold for a long period of time after being introduced into the detection region.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0030] In the following, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a schematic side view of a winding unit of a yarn 1 arranged in a yarn winding machine according to an embodiment of the present invention
[0031] The yarn winding machine of the present embodiment has a configuration in which a plurality of yarn winding units 1 are arranged in a row. The yarn winding machine comprises a machine management device (not shown) which intensively manages the yarn winding unit 1.
[0032] The winding unit of a yarn 1 shown in fig. 1 is configured to wind a yarn 10 fed by a yarn feeding section (not shown) around a winding bobbin 21 to form a bobbin 20. When the yarn winding machine is an automatic winder, as shown in fig. 1, a mechanism for supporting the yarn supplying bobbin corresponds to the yarn supply section.
[0033] Each yarn winding unit 1 comprises a control section of the unit 30. The control section of the unit 30 is configured by hardware, such as CPU, ROM and RAM, and software, such as a control program stored in the ROM and / or RAM. Through the cooperation of hardware and software, the control section of the unit 30 controls each component of the yarn winding unit 1. The control section of the unit 30 of each yarn winding unit 1 is configured to communicate with the machine management device. Therefore, the operation of each yarn winding unit 1 can be intensively managed by the machine management device.
[0034] The yarn winding unit 1 comprises, in order from the upstream position in the direction of yarn movement, the yarn feeding section, an upstream guide 11, a first yarn capture device ( yarn capture and guide) 12, a second yarn capture device (yarn capture and guide device) 13, a yarn junction device 14, a yarn monitoring device 15, a downstream guide 17 and a section winding 18.
[0035] The upstream guide 11 is arranged slightly upstream of the yarn feeding section. The upstream guide 11 guides the yarn 10 fed by the yarn feeding section.
[0036] The first yarn capture device 12 is configured to oscillate, as shown in figs. from 1 to 3, when the control section of the unit 30 drives a motor (not shown). The first yarn capture device 12 is connected to a negative pressure source (not shown) and can generate a suction flow in a distal end side (opposite to the center of oscillation) of the first yarn capture device 12.
[0037] The second yarn capture device 13 is configured to oscillate, similarly to the first yarn capture device 12, when the control section of the unit 30 drives a motor (not shown). The second yarn capture device 13 is connected to a negative pressure source (not shown) and can generate a suction flow in a distal end side (opposite to the center of oscillation) of the second yarn capture device 13.
[0038] When the yarn 10 between the yarn supply section and the winding section 18 is interrupted for some reason, the first yarn capture device 12 is made to oscillate towards the yarn supply section to suck and capture the yarn. end of the yarn from the yarn supply section, as illustrated in FIG. 2 . The second yarn-catching device 13 is made to oscillate towards the winding section 18 to suck and capture the end of the yarn from the bobbin 20.
[0039] Subsequently, the first device for capturing the yarn 12 and the second device for capturing the yarn 13 are respectively made to oscillate towards the junction device of the yarn 14 while aspirating the ends of the yarn. Therefore, the end of the yarn from the yarn feeding section and the end of the yarn from the winding section 18 are guided towards the junction device of the yarn 14, as shown in Fig. 3
[0040] The splicing device of the yarn 14 is configured as a pneumatic splice which exerts a vortex flow of air on the end of the yarn from the yarn supply section and on the end of the yarn from the winding section 18 to twist and connect the two ends of the yarn. However, the junction device of the yarn 14 is not limited to this and can be, for example, a mechanical knotter.
[0041] In a series of steps of the yarn splicing operation, the timing with which the first yarn capture device 12 and the second yarn capture device 13 are made to oscillate is controlled by the control section of the unit 30 The control section of the unit 30 operates the first yarn capture device 12 and the second yarn capture device 13 for example after a predetermined time from the occurrence of a yarn break.
[0042] The yarn monitoring device 15 monitors the state (thickness, mixture of foreign substances such as colored yarn, polypropylene and the like) of the moving yarn 10 and detects a yarn defect (portion with an anomaly in the yarn 10) contained in yarn 10. The yarn monitoring device 15 further comprises a cutter (cutting device) 16 adapted to cut the yarn 10 when the yarn monitoring device 15 detects the yarn defect. The detailed configuration of the yarn monitoring device 15 will be described below.
[0043] The downstream guide 17 is arranged slightly downstream of the yarn monitoring device 15. The downstream guide 17 guides the yarn 10 fed towards the winding section 18.
[0044] The winding section 18 comprises a support section of a bobbin (not shown) and a winding cylinder 19. The winding cylinder 19 is operated at the same time creating a contact with the outer perimetric surface of the winding bobbin 21 or of the bobbin 20. The winding section 18 drives the winding cylinder 19 by means of a motor (not shown) and winds the yarn 10 while translating at the same time the yarn 10 while rotating the bobbin 20, which creates a contact with the winding cylinder 19, to form the bobbin 20. The winding cylinder 19 is provided with a groove for translation.
[0045] The method for carrying out the translation is arbitrary, and the translation device can be arranged individually for each yarn winding unit 1 or a translation device can translate the yarn 10 of a plurality of yarn winding units 1. Furthermore, the configuration of the winding section 18 is not limited to the configuration described above. For example, instead of the winding cylinder 19 with grooves, it is possible to adopt a configuration comprising a contact roller without grooves and a translation device with an arm independent of the contact roller. In this configuration, the winding coil 21 (cone 20) is driven directly by the motor.
[0046] The cone 20 is formed by winding the yarn 10 while translating the yarn 10 by means of the arm-shifting device with the winding reel 21 (cone 20) which creates a contact with the contact roller.
[0047] When the yarn 10 of a predetermined length is wound around the winding bobbin 21 and the bobbin 20 is completely wound, the yarn 10 is automatically cut by the cutter 16 of the yarn monitoring device 15 or by other cutting means and the winding of the winding section 18 is stopped. Subsequently, the bobbin 20 is detached from the bobbin support section by an automatic doffing device or by a manual operation of an operator and in its place an empty winding reel 21 is fixed on the bobbin support section and the winding He resumes. The automatic doffing device moves towards the winding unit of the yarn 1 which emits a doffing request signal, for example to collect the cone 20. Subsequently, the automatic doffing device secures a new winding reel 21 on the section of package support and performs a predetermined engagement operation.
[0048] A description of the details of the yarn monitoring device 15, in particular of the electrical configuration, is reported below with reference to fig. 4 Fig. 4 is a block diagram illustrating an electrical configuration of the yarn monitoring device 15.
[0049] As shown in fig. 4, the yarn monitoring device 15 comprises an optical sensor unit (detection section) 35 and a yarn monitoring control section 50.
The sensor unit 35 can measure the state of the yarn 10. The sensor unit 35 comprises a drive circuit 40, a light projection section 41, a light receiving section 42, an amplifier 43, a high-pass filter 44, an amplifier circuit 45 and a light indicator (display device) 46. The cutter 16 is fixed to a housing of the sensor unit 35.
[0051] The projection section of the light 41 comprises a light-emitting element configured by means of a light-emitting diode (LED). The projection section of the light 41 radiates a space (slit-like recess of Fig. 4) through which the yarn 10 slides with a light in an amount corresponding to an actuation voltage input coming from the driving circuit 40. The voltage of The drive generated by the drive circuit 40 is determined based on an electrical signal input coming from a D / A converter 52 arranged in the yarn monitoring section 50.
[0052] The light receiving section 42 is arranged on an opposite side of the light projection section 41 with a space between them. The light receiving section 42 comprises a light receiving element configured by a photodiode and similarity. The light receiving section 42 receives the transmitted light of the light radiated from the projection section of the light 41 on the yarn 10 and emits the electrical signal (voltage) corresponding to the quantity of light received. The electrical signal varies according to the shape (shape of the cross section) of the yarn 10 present in a detection region 36. The transmitted light referred to in the present is the light that reaches the light receiving section 42 when the light output from the projection section of the light 41 is partially shielded by the presence of the yarn 10. This means that the transmitted light is the light passing through
[0053] The yarn 10. The detection region 36 is a region, in the slot recess, struck by light from the projection section of the light 41 and is a region in which the yarn 10 can be detected according to the amount of light reception of the light receiving section 42.
[0054] The electrical signal emitted by the light receiving section 42 is amplified by the amplifier 43 and, subsequently, a signal of a predetermined high frequency is extracted by means of the high-pass filter 44 and again amplified by means of the amplifier circuit 45. An inversion process is performed in the amplifier 43 and the electrical signal emitted by the amplifier 43 is reduced with the increase in the amount of light reception of the light receiving section 42. The electrical signal amplified by the amplifier 43 and by the circuit amplifier 45 is issued as a reference value by the sensor unit 35 and converted into a digital signal by an A / D converter 51 of the yarn monitoring section 50.
[0055] The luminous indicator 46 is fixed, for example, to a housing of the sensor unit 35 and indicates to the operator the operating status of the yarn monitoring device 15 being switched on and off. In the present embodiment, the light indicator 46 is configured as a so-called two-color LED and can be illuminated, for example, with green and red. The lighting status of the light indicator 46 is controlled by the yarn monitoring section 50.
[0056] The cutter 16 is arranged near the sensing region 36 formed in the housing of the sensor unit 35. The cutter 16 comprises a cutting blade (not shown) driven, for example, by a solenoid. The cutter 16 is electrically connected to the monitoring control section of the yarn 50 and is configured to cut the yarn 10 based on a shear signal issued by the yarn monitoring section 50.
[0057] The monitoring section for monitoring the yarn 50 stores, in a storage section 57 described below, an evaluation reference value (zero point) obtained starting from the detection value emitted by the sensor unit 35 when the yarn 10 is not present in the detection region 36. An evaluation section 53 of the yarn monitoring monitoring section 50 compares the evaluation reference value with the detection value, which is emitted from time to time by the sensor unit 35 when the yarn 10 is present in the detection region 36, to evaluate (measure) the state of the yarn 10.
[0058] Next, a description of an adjustment process, a measurement process and a correction process performed by the yarn monitoring device 15 will be provided. The monitoring control section of the yarn 50 comprises an adjustment section 54, a section of acquisition 55, a section for determining the presence / absence of yarn 56, a setting section 58 and storage section 57 as components for performing the aforementioned processes. Specifically, the yarn monitoring section 50 is configured as a computer comprising hardware, such as CPU, ROM and RAM, and software, such as a control program stored in ROM and / or RAM. Through the cooperation of hardware and software, the monitoring section for monitoring the yarn 50 can function as an adjustment section 54, an acquisition section 55, a section for determining the presence / absence of yarn 56, setting section 58 and the like.
[0059] The adjustment section 54 carries out the adjustment process. The adjustment process is a process for adjusting an actuation voltage to be applied to the projection section of the light 41 in the sensor unit 35 so that the detection value (specifically, the output voltage) emitted by the unit of sensor 35 coincides with a predetermined adjustment reference value in a state in which the yarn 10 is not present in the detection region 36 of the yarn monitoring device 15.
[0060] The acquisition section 55 performs the measurement process. The measurement process is a process for controlling the sensor unit 35 so that the voltage regulated by the adjustment process is applied to the light projection section 41 and to acquire the detection value actually emitted by the sensor unit. 35 in a state in which the yarn 10 is not present in the detection region 36 of the yarn monitoring device 15. It is assumed that the detection value (specifically, the output voltage of the sensor unit 35) obtained in this mode is a value substantially equal to the reference adjustment value in the adjustment process but can be a divergent value, for example due to the influence of environmental change (thermal drift and the like). It is determined whether the detection value acquired by the acquisition section 55 satisfies a predetermined condition (specifically, if the detection value is lower than a normal interval threshold value, described below), and the detection value that satisfies that condition is stored in the storage section 57 described below.
[0061] The section for determining the presence / absence of the yarn 56 determines whether the yarn 10 is present in the detection region 36 (in particular, in the yarn path) of the yarn monitoring device 15 and whether the yarn 10 is introduced into the yarn sensing region 36 (in particular, in the yarn path) based on the detection value acquired by the acquisition section 55. Specifically, the section for determining the presence / absence of the yarn 56 determines that the yarn 10 is present in the path of yarn (the yarn is present) if the emitted voltage of the sensor unit 35 is greater than or equal to a predetermined threshold value (threshold value for determining the presence / absence of the yarn) and determines that the yarn 10 is not present in the yarn path (the yarn is absent) if the emitted voltage is not greater than or equal to the predetermined threshold value. The detection region 36 is a space having a predetermined size. The yarn path in the sensing region 36 can be represented as a position in which the yarn 10 moves, the position being regulated by a pair of upper and lower yarn path guides (not shown) (position of a point in the view flat: predetermined position).
[0062] The memorization section 57 has a storage region in which the content can be updated and, for example, is realized by means of a rewritable volatile or non-volatile memory (for example, RAM and EEPROM) and the like. The storage section 57 can store various parameters and the like to control the yarn monitoring device 15.
[0063] Specifically, the storage section 57 can store a plurality of measurement values obtained by the acquisition section 55. This means that, instead of performing the measurement process only once, the acquisition section 55 repeatedly executes, to a plurality of times, a measurement process for each predetermined time interval until the yarn 10 is introduced into the yarn path in the detection region 36 of the yarn monitoring device 15 (the position of the yarn 10 is defined in the yarn path : positioning) to acquire the detection value each time. The storage section 57 can store the data of the detection value for a predetermined number of times in the order of time series.
[0064] The memorization section 57 can store a threshold value of normal range (first threshold value) to define the boundary of the interval (predetermined interval), generally assumed by the detection value, when the yarn 10 is not present in the sensing region 36 of the yarn monitoring device 15. If the detection value of the acquisition section 55 is outside the range defined with the normal interval threshold value, it is assumed that this detection value is anomalous and it it is not stored in the storage section 57.
[0065] Although the details will be described below, the evaluation reference value is defined based on the detection value stored in the storage section 57. Therefore, if the detection value obtained from the acquisition section 55 is greater than or equal to the normal range threshold value, this irregular detection value is not stored in the storage section 57 and therefore is not used for determining the evaluation reference value from the setting section 58.
[0066] Furthermore, the storage section 57 can store the threshold value for determining the presence / absence of the yarn (according to the threshold value) described above, which is the threshold value used as a border for the presence determination section / absence of the yarn 56 to determine the presence / absence of the yarn 10. A value higher than the threshold value of the normal interval (value close to the value of the state in which the yarn is present) is set for the threshold value for determining the presence / absence of yarn. In the present embodiment, the inversion process is performed in the amplifier 43 in such a way that the detection value decreases with the increase in the light receiving quantity of the light receiving section 42 but it is possible that this inversion process does not be executed. When the reversal process is not executed, the magnitude relation of the detection value is reversed. This means that a value lower than the normal interval threshold value (value close to the value of the state in which the yarn is present) is set for the threshold value for determining the presence / absence of the yarn. The threshold value for determining the presence / absence of the yarn is a value outside the normal range regardless of the presence / absence of the inversion process.
[0067] The memorization section 57 can furthermore store a set value of the evaluation reference value determined by the setting section 58 which will be described below. The evaluation section 53 evaluates the status of the yarn 10 by comparing it with the evaluation reference value. Specifically, an average value of the difference between the voltage set for the evaluation reference value and the voltage obtained from the sensor unit 35 with the yarn 10 in the detection region 36 of the yarn monitoring device 15 is used for monitoring. of the yarn 10 (for example, calculation of the average thickness of the yarn 10).
[0068] The setting section 58 determines (calculates) the magnitude of the evaluation reference value based on the detection value which satisfies a predetermined condition between the detection values obtained by the acquisition section 55 and stored in the memorization section 57, and stores the result in the storage section 57 as a new set value. Therefore, in the present embodiment, the term "correction" in the correction process indicates the re-memorization of the new evaluation reference value in the storage section 57. This means that the correction process is not a process of changing the value of reference substantially by adjusting the actuation voltage to be applied to the light projection section 41 but it is a process of changing the reference value in the calculation.
[0069] A stationary time counting section 59 counts the time during which the yarn 10 is stationary without starting its movement since the determination / presence section of the yarn 56 determines that the yarn is present. The count value is used to determine whether to perform forced cutting of yarn 10, described below.
[0070] Subsequently, a description of the determination of the evaluation reference value in the present embodiment will be given.
[0071] As described above, the light projection amount of the light projection section 41 and the light receiving amount of the light receiving section 42 may vary, for example due to various causes such as changing the environment surrounding (temperature, humidity and the like), the attack of contaminants and the like. Conventionally, the adjustment process is carried out to adjust the actuation voltage of the light projection section 41 and, subsequently, the yarn is monitored with the amount of light reception (detection value) measured immediately after the adjustment process as a reference. .
[0072] However, in the present embodiment, the projection section of the light 41 is configured by means of an LED. Therefore, for example, immediately after switching on the yarn monitoring device 15, even if the light receiving quantity is measured immediately after the adjustment process has been carried out, the quantity (light projection quantity) of the radiated light from the projection section of the light 41 it can vary as the temperature of the projection section of light 41 (thermal drift) gradually increases after the measurement of the amount of light reception.
[0073] The variation of the light projection amount of the light projection section 41 influences the evaluation of the state of the yarn 10 and the like. The graph of fig. 5 illustrates the variation in the detection value in an ideal case without thermal drift (dotted line) and in one case with thermal drift (continuous line). If the thermal drift does not occur, the detection value obtained is constant until the yarn 10 is introduced into the detection region 36 of the yarn monitoring device 15 after the adjustment process. If thermal drift occurs, the detection value begins to increase gradually immediately after the adjustment process.
[0074] In this regard, in the known art the yarn 10 introduced into the detection region 36 was evaluated with the detection value immediately following the adjustment process as a reference. There are no problems if the thermal drift does not occur but in fact the thermal drift occurs easily, particularly immediately after switching on. Therefore, in the conventional method, the average value of the thickness of the yarn 10 can include an error corresponding to the thermal drift.
[0075] On the other hand, in the present embodiment, the detection value acquired with a timing immediately before the introduction of the yarn 10 in the detection region 36 instead of immediately following the adjustment process is used as an evaluation reference value, and the yarn 10 can be evaluated with this detection value as a reference. Therefore, it is possible to make an accurate assessment of the yarn eliminating the influence of thermal drift and the like.
[0076] Now the description of a method of the monitoring control section of the yarn 50 of the present embodiment to determine the evaluation reference value in various cases will be provided by referring to the graphs of Figs. from 6 to 8.
[0077] As described above, after the adjustment section 54 has carried out the adjustment process, the acquisition section 55 acquires in an iterative way the detection value with appropriate time intervals until the introduction of the yarn 10 is detected. in the yarn path of the detection region 36. In the graph of FIG. 6, the horizontal axis indicates the time and the vertical axis indicates the detection value, and the detection values (candidate data for reference values) acquired in each time from t1 to t15 are illustrated. The graph of fig. 6 also illustrates the threshold value of the normal range and the threshold value for determining the presence / absence of the yarn.
[0078] The acquisition section 55 repeats the acquisition of the detection value in a time ti, a time t2 and so on. In the example shown in fig. 6, as the acquisition of the detection value increases, the detection value emitted by the sensor unit 35 becomes higher due to the influence of the thermal drift. Finally the detection value becomes higher than the threshold value of the normal interval at the acquisition time t14, as in the case of t15. The detection values in the two acquisition times t14 and t15 are lower than the threshold value for determining the presence / absence of the yarn.
[0079] Unless the detection value acquired by the acquisition section 55 does not become greater than or equal to the normal interval threshold value, the monitoring section of monitoring of the yarn 50 stores, as necessary, the detection value in the section of storage 57 as a candidate that can be used to calculate the next evaluation reference value. Therefore, the detection values acquired in times i1 to 13 are stored in storage section 57. The detection values acquired in times t14 and t15 are greater than or equal to the normal range threshold value and therefore are not stored in the section of storage 57.
[0080] When the detection values always become greater than or equal to the threshold value of the normal range as in t14 and t15, it is assumed that the influence of the thermal drift is present in an unacceptable degree. Therefore, if the detection value (detection value between the normal interval threshold value and the threshold value for determining the presence / absence of the yarn) greater than or equal to the threshold value of the normal interval and lower than the threshold value of determination of the presence / absence of the yarn is obtained twice in a row, the monitoring section controlling the yarn 50 performs a check to perform the adjustment process again by means of the adjustment section 54. In addition, the measurement process is carried out. Rerun after the re-adjustment process is complete.
[0081] Next, a description will be given of a case in which the detection value is induced into a transition as shown in FIG. 7 In the example of fig. 7, the detection value has a tendency to increase starting from time ti, but the influence of the thermal drift substantially converges with time and the detection values are stabilized from t11 to t13. However, the detection value in time t14 becomes higher than the normal interval threshold value and in t15 the detection value becomes higher than the threshold value for determining the presence / absence of the yarn.
[0082] In this case, the monitoring section for monitoring the yarn 50 stores the detection values in the storage section 57 since the detection values acquired by the acquisition section 55 within the times t1 to t13 are lower than the threshold value of normal interval. On the other hand, the detection values acquired in times t14 and t15 are greater than or equal to the normal range threshold value, and therefore are not stored in the storage section 57.
[0083] Since the detection value obtained at time t15 is greater than the threshold value for determining the presence / absence of the yarn, the determination of the presence / absence of yarn 56 determines that the yarn 10 is introduced into the yarn path of the yarn detection region 36 (the yarn is present). In this case, the setting section 58 reads from the storage section 57 a predetermined number of the most recent detection values acquired before the acquisition timing, which corresponds to a predetermined number of times (in the present embodiment, three times) preceding the time in which it is determined that the yarn is present, and calculates an average value to set the value obtained as an evaluation reference value. The correction process can be performed this way.
[0084] The case of fig. 7 and the case of fig. 6 have in common the fact that the detection value exceeds the normal interval threshold value for the first time in time t14. However, in the case of fig. 7, the detection value in the subsequent time t15 exceeds the threshold value for determining the presence / absence of the yarn and, therefore, it is determined that the yarn is present and the evaluation reference value is calculated, whereas, in the case of FIG. . 6, the detection value in the following time t15 lies between the threshold value of the normal interval and the threshold value for determining the presence / absence of the yarn, and therefore the process is performed again starting from the adjustment process. Therefore, in the present embodiment, when the detection value exceeds the normal interval threshold value, the subsequent process differs depending on whether the subsequent detection value exceeds or not the threshold value for determining the presence / absence of the yarn.
[0085] As described above, in the monitoring device of a yarn 15 of the present embodiment, the evaluation reference value is not determined until the section for determining the presence / absence of the yarn 56 does not determine that the yarn 10 is introduced into the yarn path of the sensing region 36, and the acquisition section 55 continues to acquire iteratively new detection values (candidate data to reference values). Therefore the evaluation reference value can be defined using the detection value close to the time in which the yarn 10 is introduced into the detection region 36, so that the influence of the thermal drift and the like can be eliminated as far as possible.
[0086] The detection value, acquired with the timing which corresponds to a predetermined number of times (three times) preceding the time in which it is determined that the yarn is present, is selected as a detection value to calculate the average of the values of evaluation reference. This occurs because the detection value immediately preceding the introduction of the yarn 10 in the yarn path often varies due to the influence of the movement of the yarn 10. For example, as illustrated in Fig. 8, a transition occurs whereby the detection value is stabilized up to the time t12, but the detection value goes down once in the times t13 and t14 until the yarn 10 enters the detection region 36 and moves towards the path of yarn in the detection region 36 and ends by defining the position in the yarn path (housed in the yarn path), and the detection value increases drastically in the time t15, which is immediately after the time t14, and exceeds the determination threshold value of the presence / absence of the yarn. It is assumed that this phenomenon occurs because, during the introduction of the yarn 10 in the detection region 36, the light receiving section 42 is radiated directly with the light from the projection section of the light 41 and also radiated with the light radiated by the projection section of the light 41 and reflected from the yarn 10, so that the detection value is reduced. When the detection value is induced in a transition such as that shown in fig. 8, the detection values in times t13 and t14 are stored in storage section 57, but it is not appropriate to obtain the evaluation reference value using the detection value during the variation. Therefore, the setting section 58 of the present embodiment calculates the evaluation reference value using the most recent detection values up to the acquisition timing which corresponds to three times preceding the time in which it is determined that the yarn is present, as described on. Therefore, it is possible to prevent the unstable behavior of the detection value in a time too close to the moment in which the yarn 10 assumes the position in the yarn path, to reflect on the evaluation reference value.
[0087] Subsequently, referring to the flow chart of Fig. 9, the description of a specific process performed by the adjustment section 54, by the acquisition section 55, by the determination section of the presence / absence of the yarn 56, by the setting section 58 and similar of the yarn monitoring control section will be provided. 50.
[0088] The adjustment process, the measurement process and the like illustrated in fig. 9 are performed, with the exception of ignition of the yarn monitoring device 15, each time the yarn 10 is interrupted for some reason and is not present in the detection region 36 of the yarn monitoring device 15, and the yarn splicing operation by the yarn splicing device 14 and the yarn 10 is again introduced into the detection region 36. A case in which the yarn 10 is interrupted comprises the case in which the yarn monitoring device 15 finds the defect of yarn and cuts the yarn 10 by means of the cutter 16, the case in which the cone 20 is completely wound and the yarn 10 is cut by the cutter 16 and the like, and the case in which a yarn breakage has occurred. Since the adjustment process and the measurement process are performed frequently as described above, the yarn 10 can be monitored in a stable manner independently of a change in the surrounding environment, from an attack of contaminants in the light projection section 41, in the light receiving section 42 and the like of the yarn monitoring device 15, and the like.
[0089] If the process of fig. 9 is started without the yarn 10 being present in the detection region 36 of the yarn monitoring device 15, first the adjustment process is performed by the adjustment section 54 and the actuation voltage of the projection section of the light 41 in the sensor unit 35 is adjusted as described above (step S101). After the adjustment process is completed, the iterative acquisition processes (steps S102 to S106) of the detection values are immediately started by the acquisition section 55.
[0090] Specifically, the acquisition section 55 controls the sensor unit 35 so as to apply the actuation voltage regulated by the adjustment process on the light projection section 41 and acquires the detection value actually emitted by the unit of sensor 35 (measurement process described above, step S102). Subsequently, the section for determining the presence / absence of the yarn 56 determines whether the detection value acquired by the acquisition section 55 is greater than or equal to the threshold value for determining the presence / absence of the yarn (step S103). When the detection value is lower than the threshold value for determining the presence / absence of the yarn, it is determined whether the detection value is greater than or equal to the normal interval threshold value (step S104). When the detection value is lower than the normal interval threshold value, the detection value is memorized in the storage section 57 (S105), the process returns to the S102 phase and the acquisition of the detection value is repeated again by the section of acquisition 55.
[0091] When the detection value is greater than or equal to the normal interval threshold value in the determination of S104, it is determined whether the detection value acquired by the acquisition section 55 for the previous time is greater than or equal to the threshold value of normal range (phase S106). When both the detection value for the current time and the detection value for the previous time are greater than or equal to the normal interval threshold value, it is assumed that an unacceptable thermal drift has occurred, and therefore the process returns to phase S101 and the process is performed again starting from the adjustment process of the adjustment section 54. When the detection value for the current time is greater than or equal to the normal interval threshold value but the detection value for the previous time is lower than the normal interval threshold value in the determination of S106, the process (step S105) for storing the detection value in the storage section 57 is skipped, the process returns to step S102 and the detection value is acquired again from the acquisition section 55 .
[0092] When the detection value is greater than or equal to the threshold value for determining the presence / absence of the yarn in the determination of step S103, the setting process (step S107) of the evaluation reference value is performed by means of the section of setting 58. Specifically, the setting section 58 selects and reads a predetermined number of more recent detection values acquired before the timing which corresponds to a predetermined number of times preceding the current time instant between a plurality of detection values stored as time series in the storage section 57, and calculates an average value thereof to acquire a new value of the evaluation reference value. The value obtained from the evaluation reference value is stored in the storage section 57.
[0093] Subsequently, the winding of the yarn 10 is started, and the evaluation section 53 evaluates the yarn 10 moving through the detection region 36 on the basis of the new value of the evaluation reference value (step S108).
[0094] According to the above processes, the evaluation section 53 of the yarn monitoring section 50 can satisfactorily eliminate the influence of the thermal drift and the like of the light projection section 41 and can accurately evaluate the state of the yarn 10.
[0095] Next, the description of the control of the light indicator 46 will be provided. The monitoring section for monitoring the yarn 50 controls the light indicator 46 so that it is turned off during the adjustment process of the phase S101 and lit green during the measurement process of the S102 phase and the yarn monitoring of the S108 phase. If an anomaly occurs in the yarn monitoring device 15, the monitoring section of monitoring of the yarn 50 performs the check in such a way that the light indicator 46 lights up red. This means that, in the monitoring device of the yarn 15 of the present embodiment, the light indicator 46 is controlled so as to have different display states during the adjustment process and during the measurement process, i.e. an off state during the adjustment process is a green illuminated state during the measurement process. The indicator light 46 is controlled in such a way that the display status is the same, ie illuminated with green, during the monitoring of the yarn 10 and during the measurement process. Moreover, when an anomaly occurs, the light indicator 46 is controlled so as to be illuminated with red, which is a display state different from any display state during the adjustment process (off), the measurement process ( illuminated in green) and yarn monitoring (illuminated in green). With the control of the light indicator 46 described above, the operator can easily recognize the status and similarities of the process performed in the yarn monitoring device 15.
[0096] In the winding unit of the yarn 1 of the present embodiment, the doffing operation to detach the completely wound cone 20 and attach an empty winding reel 21, as described above, can be performed manually by the operator. The doffing operation includes the following operations: pulling the yarn 10 out of the yarn feeding section (not shown), passing the yarn 10 through the sensing region 36 of the yarn monitoring device 15, fixing the yarn the end of the yarn 10 to the empty winding bobbin 21 and give the instruction to start the winding to the yarn winding unit 1.
[0097] However, when the operator performs the doffing operation, it is possible that for some reason the instruction to start the winding to the yarn winding unit 1 will not be imparted although the setting of the yarn 10 in the device for monitoring the yarn 15 and fixing the yarn 10 to the winding bobbin 21 are completed, and the yarn 10 can be left on hold for a long period of time.
[0098] In this case, even if the evaluation reference value was set using the detection value immediately preceding the introduction of the yarn 10 in the detection region 36 of the yarn monitoring device 15, together with the doffing operation , the yarn monitoring section 50 can be in the situation where the monitoring of the yarn 10 cannot be started subsequently and a long period of time passes. While the yarn is left on hold, it is possible that a thermal drift which is too high to be tolerated in the projection section of the light 41 may occur, and therefore, even if subsequently the operator gives the instruction to start the winding, it is not appropriate evaluate the yarn 10 using the evaluation reference value set for this time as it is. Since the state in which the yarn 10 is introduced into the sensing region 36 of the yarn monitoring device 15 continues, the old set value of the evaluation reference value cannot be discarded to reset the setting.
[0099] To solve such problems, the monitoring section for monitoring the yarn 50 of the present embodiment is configured to determine if the yarn 10 has started to move while the evaluation section 53 continuously monitors the detection value obtained from the sensor unit 35 after the yarn presence / absence determination section 56 has determined that the yarn is present. The determination whether the yarn 10 is in motion or is stationary (hereinafter sometimes referred to as the determination of movement) is made, for example, based on the magnitude of the variation in the detection value obtained by the sensor unit 35.
[0100] The stationary time counting section 59 of the yarn monitoring section 50 is configured to increment by one a count value indicating the time elapsed in the steady state when it is determined that the yarn 10 is stationary as a result of the determination of movement performed by the evaluation section 53. The yarn monitoring control section 50 performs a check to operate the cutter 16 to cut the yarn 10 over time (time t95 in the example shown in Fig. 10) in which the value of count reaches a predetermined value.
[0101] Therefore, if a state in which the yarn 10 is present in the detection region 36 but the start of the movement is not detected continuously for a predefined time or beyond, the yarn 10 is forcibly cut and the operator performs the operation again the operation of removing from the state in which the yarn 10 is removed from the detection region 36 of the yarn monitoring device 15. Therefore, it is possible to guarantee the possibility of the monitoring control section of the yarn 50 (setting section 58) to zero. 11 evaluation reference value and accurate monitoring of the yarn status 10.
[0102] As described above, the yarn monitoring device 15 of the present embodiment comprises the sensor unit 35, the acquisition section 55, the setting section 58 and the evaluation section 53. The sensor unit 35 emits a detection value corresponding to the presence / absence of the yarn 10 in the detection region 36 or to the state of the yarn 10. The acquisition section 55 acquires the detection value in the state in which the yarn 10 is not present in the detection region. The setting section 58 sets the evaluation reference value which can be used to evaluate the state of the yarn 10 based on at least one of a plurality of detection values obtained by repeating the acquisition of the detection value by the acquisition section 55 until the yarn 10 is not introduced into the sensing region 36. The evaluation section 53 evaluates the state of the yarn 10 based on the evaluation reference value set by the setting section 58.
[0103] Therefore, by means of the continuous and iterative acquisition of the detection value, it is possible to obtain, for example, the detection value immediately before the introduction of the yarn 10 in the detection region 36. Therefore, the influence of the thermal drift and similar is reduced by defining the valuation reference value using the acquisition value acquired with the relevant timing. Therefore, it is possible to accurately detect the state of the yarn 10.
[0104] The yarn monitoring device 15 of the present embodiment comprises the section for determining the presence / absence of the yarn 56 suitable for determining whether the yarn 10 is introduced into the detection region 36. The setting section 58 sets the value of evaluation reference based on the detection value acquired by the acquisition section 55 before the determination / presence section of the yarn 56 determines that the yarn 10 is introduced into the detection region 36.
[0105] This means that, even if the detection value is acquired after the yarn 10 is introduced into the detection region 36, this detection value cannot be used as a reference value, and therefore an appropriate evaluation reference value it can be set not using this detection value.
[0106] Furthermore, in the yarn monitoring device 15 of the present embodiment, the sensor unit 35 comprises the projection section of the light 41 able to project the light into a space through which the yarn 10 slides, and the section reception of the light 42 adapted to receive the light projected from the projection section of the light 41 and to emit an electrical signal corresponding to the quantity of reception of the light. The yarn monitoring device 15 comprises the adjustment section 54. The adjustment section 54 performs the adjustment process to adjust the light projection amount of the light projection section 41 so that the detection value in the state in which where the yarn 10 is not present coincides with a value (adjustment reference value) defined above.
[0107] In other words, the light projection amount of the light projection section 41 and the light receiving amount of the light receiving section 42 may vary due to an environmental change such as thermal drift. Therefore, the reference value can be adjusted according to the environmental change by performing the adjustment process, and the accuracy of evaluation of the state of the yarn 10 can be stabilized.
[0108] The yarn monitoring device 15 of the present embodiment comprises the memorization section 57 suitable for memorizing the threshold value of the normal interval and the threshold value for determining the presence / absence of the yarn. The normal range threshold value indicates a predetermined interval with respect to the detection value in a state in which the yarn 10 is not present in the detection region 36. The threshold value for determining the presence / absence of the yarn is a threshold value to determine whether the yarn 10 is present or absent in the detection region 36 and is a threshold value higher than the normal range threshold value. When the acquisition section 55 acquires the detection value greater than or equal to the threshold value of the normal interval and lower than the threshold value for determining the presence / absence of the yarn immediately after the acquisition of the detection value greater than or equal to the value of normal range threshold, the adjustment section 54 performs the adjustment process.
[0109] This means that, when the yarn 10 is introduced into the detection region 36, the detection value emitted by the sensor unit 35 generally varies considerably, and the acquisition section 55 can acquire the beginning of such variation as detection value. If the influence of thermal drift is too high to be tolerated, the adjustment process for adaptation to environmental change is preferably performed. In this regard, according to the configuration of the present embodiment, during the acquisition by the acquisition section 55 of the detection value a plurality of times, if the detection value is obtained greater than or equal to the normal interval threshold value and , immediately afterwards, the detection value greater than or equal to the threshold value of the normal range and lower than the threshold value for determining the yarn detection is obtained, as illustrated in t14 and t15 of fig. 6, it is assumed that the detection value is increased due to the influence of the thermal drift, and therefore the regulation process is performed. Therefore, the adjustment process is performed only when necessary, whereby the influence of the thermal drift and the like can be accurately eliminated without reducing the efficiency, and the state can be reported in the condition in which the state of the yarn 10 can be accurately assessed by the evaluation section 53.
[0110] In the yarn monitoring device 15 of the present embodiment, when the acquisition section 55 acquires the detection value greater than or equal to the normal interval threshold value and, immediately afterwards, acquires the detection value greater than or equal to the threshold value for determining the presence / absence of the yarn, the section for determining the presence / absence of yarn 56 determines that the yarn 10 is positioned in the detection region 36.
[0111] Therefore, it is possible to determine with a simple process whether the yarn 10 is introduced into the detection region 36, with a clear distinction from the case in which the detection value becomes greater than or equal to the normal interval threshold value due to the influence of thermal drift and the like.
[0112] Moreover, in the monitoring device of the yarn 15 of the present embodiment, the detection value acquired by the acquisition section 55 is stored in the storage section 57. The setting section 58 sets the evaluation reference value based on the sensing value stored in storage section 57. However, if the detection value acquired by the acquisition section 55 becomes greater than or equal to the normal interval threshold value, the storage of the detection value in the storage section 57 is stopped.
[0113] This means that, if the value outside the range generally assumed by the value is acquired as a detection value, it is not appropriate to use this detection value for the calculation of the valuation reference value. In this regard, it is possible to reliably prevent the detection value greater than or equal to the normal range threshold value from being used for the evaluation reference value, preventing the detection value greater than or equal to the normal interval threshold value be stored in the storage section 57.
[0114] Furthermore, in the yarn monitoring device 15 of the present embodiment, when the section for determining the presence / absence of the yarn 56 determines that the yarn 10 is introduced into the detection region 36, the setting section 58 sets the value of reference of evaluation based on the detection value obtained before the acquisition timing of the detection value, which corresponds to a predetermined number of times prior to the relevant determination.
[0115] This means that, during the introduction of the yarn 10 into the detection region 36, the detection value emitted by the sensor unit 35 can exhibit an unstable behavior.
[0116] In this regard, in the present embodiment, by adopting the detection value preceding a time instant which corresponds to a predetermined number of times preceding the time instant in which it is determined that the yarn 10 is introduced into the detection region 36 , the valuation reference value can be set using an appropriate detection value from which the influence described above is eliminated.
[0117] In the monitoring device of the yarn 15 of the present embodiment, the setting section 58 sets, as an evaluation reference value, the average value of the plurality of detection values acquired by the acquisition section 55.
[0118] Therefore, it is prevented that the variation of the single detection value due to various types of disturbance is reflected on the evaluation reference value, and it is possible to define the evaluation reference value in an appropriate manner.
[0119] The yarn monitoring device 15 of the present embodiment comprises the stationary time counting section 59. The stationary time counting section 59 counts the time elapsed in a state in which the yarn 10 is stationary in the sensing region 36. When the elapsed time counted by the stationary time counting section 59 exceeds a predetermined time, the yarn monitoring device 15 cuts the yarn by means of the cutter 16 disposed in the yarn monitoring device 15.
[0120] This means that, for example, a long period of time can pass with the yarn 10 present in the detection region 36, as when the doffing operation is performed manually and, in this case, the influence of the thermal drift and the like can be a problem. Even if the set value of the old evaluation reference value is discarded to zero the evaluation reference value, the detection value in a state in which the yarn 10 is not present cannot be acquired by the acquisition section 55 since the yarn 10 is already present in the detection region 36. Thus, the detection value in a state in which the yarn 10 is not present in the detection region 36 is reacquired by forcibly cutting the yarn 10, so that the reference value of assessment can be reset.
[0121] Subsequently, the description of an alternative embodiment of the embodiment described above will be provided. In the description of this alternative embodiment, the same or similar elements to those of the above described embodiment are indicated with the same reference numbers in the drawings and the relative description can be omitted.
[0122] In the embodiment described above, the acquisition section 55 acquires the detection value in an iterated manner until the section for determining the presence / absence of the yarn 56 does not determine that the yarn 10 is present in the detection region 36. In the aforesaid alternative embodiment, a time-related signal (hereinafter sometimes referred to as yarn introduction timing) in which the yarn 10 is introduced into the sensing region 36 is provided by the control section of the unit 30 with respect to the control section of yarn monitoring 50.
[0123] In this alternative embodiment, the signal related to the yarn introduction timing is specifically a signal indicating a timing with which the first yarn capture device 12 and the second yarn capture device 13 guide the yarn 10 in the yarn joining device 14. For example, the first yarn-catching device 12 and the second yarn-catching device 13 are made to oscillate as shown in Figs. 1 to 3 to guide the yarn 10 in the yarn joining device 14, but the signal representing the start timing of the oscillation is provided by the control section of the unit 30 to the monitoring control section of the yarn 50. Normally , the timing with which the yarn 10 is introduced into the detection region 36 of the yarn monitoring device 15 is subsequent to the passage of a predefined time starting from the start of the oscillation of the first yarn capture device 12 and of the second device of yarn capture 13. Thus, the yarn monitoring section 50 can provide for the timing of yarn introduction by calculation.
[0124] The monitoring section for monitoring the yarn 50 determines the timing slightly preceding the timing for introducing the yarn as a timing for acquiring the detection value. After completion of the adjustment process by means of the adjustment section 54, the process remains pending until the acquisition timing and, when the acquisition timing arrives, the acquisition section 55 acquires the detection value emitted by the sensor unit 35 for a predetermined number of times. The setting section 58 sets the average value of the detection values as an evaluation reference value.
[0125] Subsequently, the detection value emitted by the sensor unit 35 is acquired immediately after the timing of introduction of the foreseen yarn, and this detection value is used for determining the presence / absence of the yarn 10 by the section of determination of the presence / absence of the yarn 56. It is possible to check whether the yarn 10 is introduced into the detection region 36 as expected. If the movement of the yarn 10 is started, the evaluation section 53 evaluates the state of the yarn 10. When a long period of time has elapsed with the stationary yarn 10, the yarn 10 is forcibly cut by the cutter 16, in a manner similar to the embodiment described above.
[0126] According to the above configuration, the detection value immediately prior to the introduction of the yarn 10 in the detection region is acquired, and the evaluation reference value can be set.
[0127] As described above, in the monitoring device of the yarn 15 of the aforesaid alternative embodiment, the setting section 58 acquires, from the outside, a time in which the yarn 10 is introduced into the detection region 36 and sets the value of evaluation reference based on a plurality of detection values acquired by the acquisition section 55 with a timing determined on the basis of the time acquired.
[0128] According to this configuration, the acquisition section 55 can obtain the detection value emitted by the sensor unit 35 immediately before the introduction of the yarn 10 in the detection region 36. Therefore, by defining the evaluation reference value by means of use of the detection value, it is possible to reduce the influence of thermal drift and the like and accurately assess the state of the yarn 10.
[0129] In the aforementioned alternative embodiment, the yarn winding machine (yarn winding unit 1) comprises the yarn monitoring device 15, the winding section 18, the junction device of the yarn 14, the first device of capture of the yarn 12 and the second yarn capture device 13. The winding section 18 wraps the yarn 10 to form the bobbin 20. The splicing device of the yarn 14 performs the yarn splicing operation. The first yarn capture device 12 and the second yarn capture device 13 guide the yarn 10 in the yarn joining device 14. The acquisition section 55 acquires the detection value with a timing based on the timing with which the first device of yarn 12 capture and the second yarn capture device 13 guide the yarn 10 in the yarn joining device 14. The setting section 58 sets the evaluation reference value based on the detection value measured by the acquisition section 55 .
[0130] This means that the yarn 10 is not present in the detection region 36 of the yarn monitoring device 15 in a state in which the yarn 10 is interrupted, but the yarn 10 is introduced into the detection region 36 when the the yarn splicing operation from the yarn joining device 14. Therefore, the detection value is acquired with the timing determined on the basis of the timing with which the first yarn capture device 12 and the second yarn capture device 13 guide the yarn 10 in the junction device of the yarn 14, so that the detection value immediately preceding the introduction of the yarn 10 in the sensing region 36 is obtained rationally and the evaluation reference value can be set. Consequently, it is possible to effectively eliminate the influence of thermal drift and the like. Furthermore, it is possible to reduce the number of acquisitions of the detection value, so as to reduce the load on the computer.
[0131] The preferred embodiments and the alternative embodiment of the present invention have been described above; the configurations described above can be modified as described below.
[0132] In the embodiment and in the alternative embodiment described above, the evaluation reference value is calculated by obtaining an average of the acquired detection value a plurality of times. However, the present invention is not limited to this, and the setting section 58 can set the acquired detection value only once as it is as an evaluation reference value.
[0133] In the embodiment described above, if the detection value greater than or equal to the threshold value of the normal range and lower than the threshold value for determining the presence / absence of the yarn is acquired even once immediately after the acquisition of the value of detection greater than or equal to the threshold value of the normal range (lower than the threshold value for determining the presence / absence of the yarn), the process is performed again starting from the adjustment process. However, the condition of performing the adjustment process again may occur when the detection value greater than or equal to the threshold value of the normal range and lower than the threshold value for determining the presence / absence of the yarn is acquired for a predetermined number of times. , ie two or more times, immediately after the acquisition of the detection value greater than or equal to the normal interval threshold value.
[0134] In the embodiment described above, the detection value preceding the acquisition timing, which corresponds to three times prior to the timing with which it is determined that the yarn is present by means of the section for determining the presence / absence of yarn 56, is used to calculate the valuation reference value. However, the number of times prior to the acquisition timing is not limited to three and can be defined appropriately in light of the time interval for the acquisition of the detection value and similar.
[0135] In the alternative embodiment described above, the acquisition of the detection value by means of the acquisition section 55 is performed with a timing determined on the basis of external information. However, even in the configuration of the alternative embodiment, the acquisition section 55 can iteratively acquire the detection value immediately after the adjustment process by means of the adjustment section 54, in a manner analogous to the embodiment described above. In this case, similarly to the embodiment described above, it is verified in real time whether the detection value is greater than or equal to the normal interval threshold value so as to allow a control to perform the adjustment process again when it occurs. the influence of an unacceptable thermal drift.
[0136] In the embodiment and in the alternative embodiment described above, the yarn monitoring device 15 comprises the optical sensor unit 35 having the light projection section 41 and the light receiving section 42. Alternatively, the yarn monitoring device may comprise a capacitive sensor unit. The sensor unit of the optical type and the sensor unit of the capacitive type are similar in that the detection value corresponding to the state of the yarn 10 is emitted (for example, the shape of the cross section or the quantity of fibers) present in the detection region 36. However, the capacitive yarn monitoring device is influenced more by the variation in humidity than by the thermal drift due to its properties. In this regard, it is possible to monitor the state of the yarn 10 while effectively eliminating the influence of the variation in humidity by setting the evaluation reference value by using the detection value immediately before the introduction of the yarn 10, as in the embodiment and in the alternative embodiment described above.
[0137] In the embodiment described above, the yarn monitoring device 15 has a configuration such as to incorporate a cutter 16. However, the present invention is not limited thereto, and the cutter can be arranged outside the monitoring device of the yarn 15, and the cutter can be controlled by the control section of the unit 30. In this case, the yarn monitoring section 50 controls the yarn cutting signal to the control section of the unit 30, and the Unit 30 control section operates the cutter based on the yarn cutting signal. When the present invention is applied to the spinning machine which acts as a yarn winding machine, the cutter is not specifically arranged and the spinning operation of the spinning device is stopped to cut the yarn 10 (for example, the device spinning also acts as a cutting device). Furthermore, the yarn monitoring device 15 is configured to cut the yarn 10, by means of the cutter 16 or other cutting devices, when the yarn defect is detected, but the yarn monitoring device of the present invention can be a device that only monitors the state of the yarn 10 without cutting the yarn 10 by means of the cutter 16 or other cutting devices.
[0138] A display device showing the state of the yarn monitoring device 15 can comprise, for example, a liquid crystal display device and the like in place of the light indicator 46 comprising a two-color LED.
[0139] In the embodiment described above, the yarn 10 is irradiated with the light coming from the projection section of the light 41, and the evaluation reference value is set using the light receiving section 42 which receives the transmitted light, which it is the light that has passed through the yarn 10. However, the yarn 10 can be irradiated with the light coming from the projection section of the light 41 and the evaluation reference value can be set using the light receiving section which receives the reflected light, which is the light reflected from the yarn 10.
[0140] The configuration of the present invention is not limited to the automatic winder and can be applied to other types of yarn winding machines such as, for example, a spinning machine such as the one described above. When the configuration of the present invention is applied, for example, to the spinning machine, the pneumatic spinning device corresponds to the yarn feeding section. In the spinning machine, a unit is preferably provided consisting of the yarn splicing device and the yarn capture and guide device with respect to a plurality of yarn winding units. This means that a yarn splicing carriage is provided which is mounted with the yarn splicing device and the yarn capture and guide device with respect to a plurality of yarn winding units, and is preferably configured to move along the direction in which the plurality of yarn winding units is arranged. However, it is also possible to adopt a configuration in which the spinning machine comprises a yarn splicing device for a yarn winding unit.

权利要求:
Claims (13)
[1]
1. A yarn monitoring device (15) comprising: a detection section (35) able to emit a detection value corresponding to the presence / absence of a yarn (10) in a detection region (36) and corresponding to one state of the yarn (10) when the yarn (10) is present in the detection region (36);an acquisition section (55) adapted to acquire the detection value when the yarn (10) is not present in the detection region (36);a setting section (58) adapted to set an evaluation reference value which can be used in the evaluation of the state of the yarn (10); isan evaluation section (53) able to evaluate the state of the yarn (10) on the basis of the evaluation reference value set by the setting section (58) and the detection value emitted by the sensing section (35), characterized by the fact thatthe setting section (58) sets the evaluation reference value on the basis of at least one of a plurality of detection values acquired by repeating the acquisition of the detection value by means of the acquisition section (55) until the yarn (10 ) is introduced into the detection region (36).
[2]
2. A yarn monitoring device (15) according to claim 1, characterized in that it further comprises:a section for determining the presence / absence of a yarn (56) able to determine whether the yarn (10) is present in a predetermined position of the detection region (36) and whether the yarn (10) is introduced in the predetermined position of the region detection (36),wherein the setting section (58) sets the evaluation reference value based on the detection value acquired by the acquisition section (55) before the yarn presence / absence determination section (56) determines that the yarn ( 10) is introduced in the predetermined position.
[3]
3. A yarn monitoring device (15) according to claim 2, characterized in that:the detection section (35) comprises a light projection section (41) able to project light on the sensing region (36), and a light receiving section (42) adapted to receive the light projected by the projection section of light (41) and to emit an electrical signal corresponding to a quantity of light reception, ethe monitoring device of a yarn (15) also comprises an adjustment section (54) adapted to carry out an adjustment process to adjust a light projection quantity of the light projection section (41) so that the value of detection when the yarn (10) is not present in the detection region (36) corresponds to a previously defined value.
[4]
4. A yarn monitoring device (15) according to claim 3, characterized in that it further comprises:a storage section (57) able to store a first threshold value to define one of the boundaries of a predetermined interval with respect to the detection value when the yarn (10) is not present in the detection region (36), and a second value threshold for determining whether the yarn (10) is present in the predetermined position of the detection region (36), the second threshold value being a value outside the predetermined range and a value higher than the first threshold value,in which, when the acquisition section (55) acquires the detection value between the first threshold value and the second threshold value for a predetermined number of times, that is to say one or more times, immediately after the acquisition of the value above the first threshold value, the adjustment section (54) carries out the adjustment process.
[5]
5. A yarn monitoring device (15) according to claim 4, characterized in that:when the acquisition section (55) acquires the detection value higher than the second threshold value immediately after the acquisition of the detection value higher than the first threshold value, the yarn presence / absence determination section (56) determines that the yarn (10) is introduced into the predetermined position of the detection region (36).
[6]
6. A yarn monitoring device (15) according to claim 4 or 5, characterized in that:the detection value acquired by the acquisition section (55) is stored in the storage section (57),the setting section (58) sets the evaluation reference value based on the detection value stored in the storage section (57) when the yarn (10) is not present in the detection region (36), andwhen the detection value is a value outside the predetermined range when the yarn (10) is not present in the detection region (36), the detection value is not stored in the storage section (57).
[7]
7. A yarn monitoring device (15) according to any one of claims 2 to 6, characterized in that:the setting section (58) sets the evaluation reference value on the basis of the detection value obtained before a detection value acquisition timing which corresponds to a predetermined number of times before a time instant in which the determination section of the presence / absence of the yarn (56) determines that the yarn (10) is introduced into the predetermined position of the sensing region (36).
[8]
8. A yarn monitoring device (15) according to any one of claims 2 to 7, characterized in that:the setting section (58) sets an average value of the plurality of detection values acquired by the acquisition section (55) for the evaluation reference value.
[9]
9. A yarn monitoring device (15) according to any one of claims 1 to 8, characterized in that it further comprises:a counting section (59) adapted to count a time elapsed in a state in which the yarn (10) is stationary in the sensing region (36),wherein, when the counting of the counting section (59) exceeds a predetermined time, the yarn (10) is cut by a cutting device (16) arranged in the yarn monitoring device (15) or an external cutting device.
[10]
10. A yarn monitoring device (15) comprising:a detection section (35) able to emit a detection value corresponding to the presence / absence of a yarn (10) in a detection region (36) and corresponding to a state of the yarn (10) in which the yarn (10) it is present in the detection region (36);an acquisition section (55) adapted to acquire the detection value when the yarn (10) is not present in the detection region (36);a setting section (58) adapted to set an evaluation reference value which can be used in the evaluation of the state of the yarn (10); isan evaluation section (53) able to evaluate the state of the yarn (10) on the basis of the evaluation reference value set by the setting section (58) and the detection value emitted by the sensing section (35), characterized by the fact thatthe acquisition section (55) acquires, from the outside, a time in which the yarn (10) is introduced into the detection region (36), and acquires one or a plurality of detection values with a timing determined on the basis of time acquired, andthe setting section (58) sets the evaluation reference value on the basis of at least one of the plurality of detection values acquired by repeating the acquisition of the detection value acquired by the acquisition section (55) with the determined timing.
[11]
11. A yarn winding machine characterized in that it comprises:the yarn monitoring device (15) according to claim 10;a winding section (18) able to wind a yarn (10) to form a cone (20);a splicing device for a yarn (14) suitable for performing a yarn splicing operation; isa device for capturing and guiding a yarn (12, 13) able to guide the yarn (10) in the yarn joining device (14),wherein the acquisition section (55) acquires one or a plurality of detection values with a timing determined on the basis of a timing with which the yarn capture and guide device (12, 13) guides the yarn (10) in the device of yarn splicing (14), ethe setting section (58) sets, as the evaluation reference value, the detection value or an average value of the plurality of detection values acquired by the acquisition section (55) with the determined timing.
[12]
12. A yarn winding machine characterized by comprising:in order from the upstream position in the direction of movement of a yarn (10),a section for feeding the yarn suitable for feeding the yarn (10);the yarn monitoring device (15) according to any one of claims 1 to 10; isa winding section (18) able to wind a yarn (10) to form a cone (20).
[13]
13. Method for monitoring a yarn comprising the following phases:detecting a value corresponding to a presence / absence of a yarn (10) in a detection region (36) and corresponding to a state of the yarn (10) in which the yarn (10) is present in the detection region (36);acquiring the detection value when the yarn (10) is not present in the detection region (36);set an evaluation reference value that can be used in assessing the state of the yarn (10); isevaluate the state of the yarn (10) on the basis of the evaluation reference value set by the setting section (58) and the detection value emitted by the detection section (35), characterized bysetting the evaluation reference value on the basis of at least one of a plurality of detection values acquired by repeating the acquisition of the detection value until the yarn (10) is introduced into the detection region (36).

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同族专利:

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公开号 | 公开日

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CN105460698B|2019-07-02|

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DE102015012073A1|2016-03-31|

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JP6459033B2|2019-01-30|

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JP2016064916A|2016-04-28|

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CN105460698A|2016-04-06|

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法律状态:

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